Can't connect to servers or play!

When entering the game and after trying to get into a custom game or forge or anything it says 'ATTENTION: Unable to connect to the Halo 5: Forge Lobby Service. I can’t find a fix even when changing settings in the menu it says ‘ATTENTION: Error authorising user with Halo 5: Forge Services. You be unable to access online modes.’ I also can’t search for any maps or modes and can’t see my spartan in the menus or anything any help or ways to solve would be appreciated!

I’m having the same issue, can’t seem to find a fix.